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South Lincolnshire Reservoir Strategic Solution Gate One Submission: Preliminary Feasibility Assessment South Lincolnshire Reservoir 5 July 2021 Contents Acronyms ii 1 Executive summary 1 2 Solution description 2 3 Outline project plan 6 4 Technical information 10 5 Environmental and drinking water quality considerations 19 6 Initial outline of procurement and operation strategy 23 7 Planning considerations 25 8 Stakeholder engagement 26 9 Key risks and mitigation measures 30 10 Option cost/benefits comparison 32 11 Impacts on current plan 34 12 Board statement and assurance 35 13 Solution or partner changes 35 14 Efficient spend of gate allowance 36 15 Proposed Gateway 2 activities and outcomes 39 16 Conclusions and recommendations 42 Annex A: Landscape Plans for Concept Design Options 43 i Acronyms Acronym Definition A2AT Anglian to Affinity Transfer AA Appropriate Assessment ACWG All Company Working Group AIC Average Incremental Costs AMP8 Asset Management Plan BNG Biodiversity Net Gain BSA Bulk Supply Agreement CAP Competitively Appointed Provider CCW Consumer Council for Water CDO Concept Design Option CON Consultation CRT Canal and River Trust DBFOM Design, Build, Finance, Operate and Maintain DCO Development Consent Order DO Deployable Output DPC Direct Procurement Customer DWI Drinking Water Inspectorate EA Environment Agency EAR Environmental Assessment Report EIA Environmental Impact Assessment FSA Flood Storage Area HOF Hands-off-Flow HRA Habitat Regulations Assessment IDB Internal Drainage Board INNS Invasive Non-Native Species JV Joint Venture LA Local Authority MCDA Multiple-Criteria Decision Analysis MCM Million Cubic Metres ii Acronym Definition MO-RDM Multi-Objective Robust Decision Making NC Natural Capital NFU National Farmer’s Union NPV Net Present Value OB Optimum Bias PEI Preliminary Environmental Information PMG Programme Management Group PPA Power Purchase Agreement PWS Public Water Supply REGO Renewable Energy Guarantees of Origin SAC Special Area of Conservation SCP Systematic Conservation Planning SEA Strategic Environmental Assessment SFFD South Forty Foot Drain SLR South Lincolnshire Reservoir SLWP South Lincolnshire Water Partnership SOC Strategic Outline Case SOCC Statement of Community Consultation SPA Special Protection Area SRO Strategic Resource Option TWAS Trent-Witham-Ancholme Scheme UKCP18 (Met Office) UK Climate Projections VFM Value For Money WFD Water Framework Directive WQRA Water Quality Risk Assessment WRE Water Resources East WRMP Water Resources Management Plan WRW Water Resources West WRZ Water Resources Zone iii 1. Executive summary South Lincolnshire Reservoir Solution summary Key environmental outcomes The South Lincolnshire Reservoir, or SLR, is a strategic • • Initial environmental assessments have not identified regional water resource solution that is being proposed any significant issues with the SLR concept design in the Anglian Water region to support supply to Anglian options. Water customers and Affinity Water customers via the associated Anglian to Affinity transfer solution. • The abstraction licence arrangements will be discussed with the Environment Agency to ensure no likely • Water would be abstracted when river flows allow and significant effects on designated sites, and a programme transferred to a newly constructed reservoir, expected to be of monitoring has been agreed to gather additional located in Lincolnshire, via pipeline or open water transfer. information to inform the ongoing assessments. Three potential concept design options have been • • Initial assessments indicate significant wider evaluated at three indicative sites to provide useful benefits will be realised, including opportunities for characteristics for comparison – these are not the only environmental enhancement, positive social outcomes, options being considered and work continues on the site improved climate-resilience, realisation of low-carbon selection and design processes. targets and amenity value. • The three concept designs consider the opportunities for providing benefits to other sectors. The designs include a multi-sector reservoir providing for public water supply, flood and agricultural storage, with variations including Stakeholder engagement wetlands, flood storage areas and farm irrigation reservoirs. • An extensive programme of customer engagement has been completed, and the overall consensus is that customers agree • The water resource benefit of the three SLR concept design options presented range from 151Ml/d to 182Ml/d with the need for regional water resource collaboration. considering Anglian Water as the sole recipient of the • Reservoirs are an option widely accepted by customers – with reservoir output. The conjunctive benefit would increase if the majority view that the long-term recreational, resilience a transfer to Affinity Water is adopted. and environmental benefits outweigh the localised impacts and shorter-term disruption of construction. • Whole-life costs for each option have been calculated, with costs ranging from £1.1billion to £1.8billion depending on • Ongoing stakeholder engagement will include a first phase of the extent of the design. community engagement in spring 2022, once the preferred option has been identified. Outline delivery plan • The SLR programme remains on track to be ‘construction-ready’ in AMP8, although the required ‘into-supply’ date is dependent Scheme viability upon the outcome of the regional modelling. • SLR is a viable solution that has the potential to deliver multiple benefits across sectors and considerable public • The workstreams planned for gate two will ensure there is a value. The recommendation is that the solution should robust planning and market-engagement process in place to progress through gate one, and work should continue to help inform the preferred procurement model. ensure that it is construction ready by AMP8. • The scheme is expected to be promoted as a Nationally Significant Infrastructure Project, requiring a Development Consent Order (DCO). Key risks & assumptions • The Water Resources East regional system simulator model Water quality considerations will be used to select the preferred option. The regional • Initial water-quality risk assessments have not highlighted modelling programme is relatively time constrained, and any significant issues, although the quality of the raw water ensuring this stays on programme will be essential to the sources is known to be complex. successful delivery of the SLR programme to gate two. • The output of the initial risk assessment has been used to • The timescales to align the scheme delivery with the inform the proposed treatment requirements, with a focus planning (DCO) and procurement (Direct Procurement on the need to consider customer perception (taste, odour, for Customer – DPC) requirements are currently not fully hardness) due to a change in water type. aligned and work is ongoing to mitigate the risks. 1 2. Solution description This section sets out a summary of key information and an initial overview of the South Lincolnshire Reservoir Strategic Resource Option (SRO) solution. 2.1 Solution outline 2.2 Options and configurations • As part of WRMP19, Anglian Water and Affinity Water identified The SLR solution has considered three potential concept design an increasing supply deficit. One option considered to alleviate options for this gate one submission that have been developed and this shortage was the development of a winter storage reservoir evaluated, and a baseline option that has been costed to enable in South Lincolnshire (the SLR) and an associated inter water comparison. The options represent a combination of design features company transfer (the Anglian to Affinity Transfer or A2AT). that are being explored with stakeholders to maximise multi-sector benefits, identify the cost benefit ratios of individual features and to • The initial concept is similar to the WRMP19 solution that inform the preferred concept design for the gate two submission. consisted of a 50,000Ml reservoir, with an abstraction from the The concept design options presented here do not represent a final River Witham supported by a transfer from the River Trent. set of options or sites; the final concept design may comprise a different combination of features. • The work on the concept design to gate one has built on the WRMP19 solution by considering the wider multi-sector benefits It should be noted that all of the concept designs include the River a potential reservoir system could deliver. Trent as a key source of water for the scheme. This is as a result of the source of water assessment carried out for gate one, which • The SLR has the potential to provide many benefits to the area concluded that the deployable output (DO) would be too small in addition to providing public water supply (PWS). The following without the Trent as a source of water, both on a cost effectiveness multi-sector design features have been considered as part of the basis, and to provide a scheme that was sufficient in size to support preliminary feasibility stage: regional needs. • multi-purpose reservoir system with PWS, flood risk and irrigation storage. All the dimensions presented in this submission (including volumes, pipeline lengths, etc) and any site-specific • a flood torages area (FSA) to capture River Witham or South information such as geological and environmental Forty Foot Drain (SFFD) flows. conditions are based on indicative sites only and will be subject to change depending on the final preferred site
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